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题库 / Prep2012-CR-17
A physically active lifestyle has been shown to help increase longevity. In the Wistar region of Bellaria, the average age at death is considerably higher than in any other part of the country. Wistar is the only mountainous part of Bellaria. A mountainous terrain makes even such basic activities as walking relatively strenuous; it essentially imposes a physically active lifestyle on people. Clearly, this circumstance explains the long lives of people in Wistar.
Which of the following, if true, most seriously weakens the argument?
In Bellaria all medical expenses are paid by the government, so that personal income does not affect the quality of health care a person receives.
People living in Wistar do not have a significantly better diet than people living in other parts of Bellaria.
Many people who live in the Wistar region have moved there in middle age or upon retirement.
The many opportunities for hiking, skiing, and other outdoor activities that Wistar's mountains offer make it a favorite destination for vacationing Bellarians.
Per capita spending on recreational activities is no higher in Wistar than it is in other regions of Bellaria.
choice b, Wistar地区的人的饮食并不会比其他地区的人的饮食好很多。 strengthen the conclusion，排除他因
choice c, 许多搬家到了Wistrd的人都是中年或者退休了以后才搬家过来的。correct，他因说明平均死亡年龄相对高的原因，是因为人群分布的关系
C:W地区的人更长寿
题目说the average age at death，C选项他因削弱，由于W地区几乎是中老年人，死亡年龄肯定更大。
注意：题目中说的是 the average age at death，平均死亡年龄，如果W这个地方有很大比例的人都是在中老年的时候才搬来的，自然就将平均死亡年龄拉高了（去平均了那一部分早死的人）
CQ4 他因：这些人是外来的，暗含不一定经常walking的意思
前提：walking和寿命之间存在正相关关系
结论：this circumstance explains the long lives of people in Wistar
CQ4 他因：这些人是外来的，暗含不一定经常walking的意思
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we're talking about average age at death. if everyone who moves to wistar is old, then, at death, they will be exceptionally old, because nobody will die at a non-advanced age.